Java Coding Problems

118. Removing all elements of a collection that match a predicate

Our collection will hold a bunch of Melon:

public class Melon {  private final String type;  private final int weight;  // constructor, getters, equals(),   // hashCode(), toString() omitted for brevity}

Let's assume the following collection (ArrayList) throughout our examples to demonstrate how we can remove elements from it that match a given predicate:

List<Melon> melons = new ArrayList<>();melons.add(new Melon("Apollo", 3000));melons.add(new Melon("Jade Dew", 3500));melons.add(new Melon("Cantaloupe", 1500));melons.add(new Melon("Gac", 1600));melons.add(new Melon("Hami", 1400));

Let's take a look at the different solutions given in the following sections.